Spray-Coated Membrane Composition for Low-Gloss Black Surfaces
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Solution Overview
Problem
Existing methods for forming membranes in electronic devices and components lack the ability to achieve high designability, particularly in enhancing aesthetic appeal and light-blocking properties.
Innovation Solution
A liquid composition comprising a specific ratio of large and small inorganic particles, a resin component, and a diluent solvent is used for spray coating to form a membrane with unevenness, resulting in low glossiness, low reflectivity, and high blackness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a black membrane is provided to electronic devices to enhance designability and block light, then the aesthetic appeal and light-blocking properties are improved, but the membrane surface becomes too smooth and glossy, reducing designability
Solution Approach 1:
The patent uses a composite liquid composition containing multiple types of inorganic particles (silica, aluminum oxide, titanium oxide) with different sizes and functions. The combination of these particles creates both light-blocking capability and surface unevenness, resolving the contradiction between light-blocking property and surface texture for enhanced designability.
Solution Approach 2:
The patent introduces particles with specific size ranges (0.1-10 μm) to create local surface unevenness while maintaining overall light-blocking performance. The uneven distribution of particles creates micro-scale variations in surface topology that reduce glossiness without compromising the macro-scale light-shielding function.
2Ease of manufacture
If screen printing or in-mold molding is used to form a black membrane, then the membrane can be formed on electronic device surfaces, but the designability is insufficient due to lack of surface unevenness
Solution Approach 1:
The patent changes the physical parameters of the coating material by incorporating inorganic particles with specific size distributions (0.1-10 μm). This particle incorporation transforms the coating from a smooth film-forming material into a composition that creates surface unevenness upon drying, while maintaining ease of application through spray coating.
Solution Approach 2:
The liquid composition acts as an intermediary carrier that delivers inorganic particles to the surface. The composition includes solvents and resins that facilitate uniform particle distribution and adhesion, enabling the formation of uneven surfaces through a manufacturable spray coating process rather than complex molding operations.
3Device complexity
If a smooth black membrane is formed, then the manufacturing process is simple, but the glossiness and reflectivity are high, reducing aesthetic appeal
Solution Approach 1:
The spray-coated liquid composition self-organizes into an uneven surface structure during the drying process. The inorganic particles naturally arrange themselves in a configuration that creates surface roughness and reduces glossiness, eliminating the need for additional post-processing steps to achieve the desired aesthetic effect.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a membrane with low glossiness, low reflectivity, and high light-shielding characteristics, enhancing the designability and aesthetic appeal of electronic devices and components.
Implementation Method 1
The present invention relates to a liquid composition for forming a membrane, a membrane formed from the composition, and products comprising the membrane on its surface to be coated... To use a spray method as a membrane forming method (coating method)
Implementation Method 2
a liquid composition for forming a membrane by spray coating, comprising at least (A), (B) and (C)... (B) comprises (B1) and (B2) in an amount of 90% by mass or more, and a mass ratio of (B2) with respect to (B1): 1 is 1.8 or more and 3.3 or less... an outermost surface of a plane formed with a membrane has reflectance of 4% or less against a light having a wavelength of 550 nm
Data Source
AI summary
A liquid composition which enables formation of a membrane with high designability suitable to be provided to a variety of industrial products, such as electronic devices and electronic device components, is provided. Here, (A) indicates a resin component, (B) unevenness forming particles, (B1) inorganic small particles having a particle diameter (d1) of 0.05 μm or more and 0.4 μm or less, (B2) inorganic-type large particles having a particle diameter (d2) of 2 μm or more and 6 μm or less, and (C) a diluent solvent. The liquid composition is for forming a membrane by spray coating and comprises at least (A), (B) and (C). The (B) is contained in an amount of 20% by mass or more and 60% by mass or less in 100% by mass of a total amount of the total solid content in the composition. The (B) contains (B1) and (B2) in an amount of 90% by mass or more. A mass ratio of (B2) to (B1):1 is 1.8 or more and 3.3 or less.